Investigation of Silver-Impregnated Alumina for Removal of Radioactive Methyl Iodide

Zeolite / Apatite Composites: A Long-Term Assurance Material for the Disposal of Radioactive Waste

“…The cation exchange capacity of zeolite in the solutions including NH 4 + is very interested in the synthesis of zeolite/apatite composites; particularly, Ca 2+ in zeolite rapidly discharged under such circumstances. The HPO 4 2-or PO 4 3-in surrounding solutions can easily react to the discharged Ca 2+ and promote the nucleation and crystal growth of apatite near or on the zeolite crystals.…”

“…The HPO 4 2-or PO 4 3-in surrounding solutions can easily react to the discharged Ca 2+ and promote the nucleation and crystal growth of apatite near or on the zeolite crystals. The reaction could be homogeneously occurred, and the resultant apatite could form a thin layer tightly bonded on the surface.…”

“…According to their report, Ca 2+ in the structure of alite, released into a (NH 4 ) 3 PO 4 solution, rapidly reacts with PO 4 3-to form apatite crystals. Liu et al have also described the apatite formation mechanism on wollastonite in simulated body fluid (SBF) 28,29 .…”

“…They focused on the reactivity of silver to iodine. Then, to improve resistance to temperature, the silver-impregnated alumina with double-pore-structure has been developed 4 . The proposed materials showed really high adsorption property, however these materials could not be suitable for the disposal waste for long-term.…”

“…Although the stability of the hydrated aluminosilicate is lower in alkaline solution, it is extensively used as the adsorbent for NH 4 + , Cs + , Sr 2+ , CO 2 and I 2 [8][9][10][11][12][13][14][15][16] . Hydroxyapatite [Ca 10 (PO 4 ) 6 (OH) 2 ; HAp] has very low solubility products of under 5.4×10 -119 (Ksp; mol 18 l -18 ), and shows particularly high stability in alkaline solution 17 .…”